Ed Butler, a medically-retired U.S. Army veteran, asks questions about a part of a B-1B to Staff Sgt. Courtney Armstrong, 28th Aircraft Maintenance Squadron crew chief, during a tour at Ellsworth Air Force Base, S.D., Jan. 17, 2012. A retired military member diagnosed with terminal cancer, Butler was able to fulfill one of his last wishes, touring a B-1B. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)